Q: Which equation best represents the change in DNA content during the cell cycle, where $$C is $$the DNA content per cell?

$$C \to 2C$$ during S phase, then $$2C \to C$$ after cytokinesis

Question 1

Which of the following best describes the main purpose of the S phase in the eukaryotic cell cycle?

Accepted Answer

Each chromosome is duplicated so that each consists of two sister chromatids.

Question 2

A researcher observes a cell with duplicated chromosomes, but the cell has not yet begun mitosis. In which phase of the cell cycle is this cell most likely to be?

Accepted Answer

G2 phase

Question 3

During which phase of the cell cycle does the cell primarily grow and synthesize proteins required for DNA replication, but has not yet begun DNA synthesis?

Accepted Answer

G1 phase

Question 4

If a cell fails to properly replicate its DNA during S phase but proceeds to mitosis, what is the most likely consequence?

Accepted Answer

The daughter cells may inherit incomplete or damaged genetic material.

Question 5

Which checkpoint in the cell cycle is primarily responsible for ensuring that all DNA has been accurately replicated before the cell enters mitosis?

Accepted Answer

G2 checkpoint

Question 6

A cell is observed to be in a non-dividing, quiescent state. Which phase of the cell cycle is it most likely in?

Accepted Answer

G0 phase

Question 7

Which of the following correctly matches a cell cycle phase with its main event?

Accepted Answer

S phase – Chromosome duplication

Question 8

A mutation causes a cell to skip the G2 phase. What is the most likely result?

Accepted Answer

The cell may enter mitosis with unprepared or damaged DNA.

Question 9

Which equation best represents the change in DNA content during the cell cycle, where $$C is $$the DNA content per cell?

Accepted Answer

$$C 	o 2C$$ during S phase, then $$2C 	o C$$ after cytokinesis

Question 10

Which of the following best explains why interphase is the longest phase of the cell cycle?

Accepted Answer

It encompasses G1, S, and G2 phases, during which the cell grows, replicates DNA, and prepares for division.

Question 11

A scientist is studying a rapidly dividing mammalian cell culture. She notes that the duration of G1, S, and G2 phases are not equal. Which phase is typically the shortest?

Accepted Answer

M phase

Question 12

Which of the following is NOT a major event that occurs during interphase?

Accepted Answer

Chromosome condensation

Question 13

If a cell is unable to pass the G1 checkpoint, what is the most likely outcome?

Accepted Answer

The cell will enter G0 phase and stop dividing.

Question 14

Which of the following best describes the role of checkpoints in the cell cycle?

Accepted Answer

They monitor and verify whether the processes at each phase of the cell cycle have been accurately completed before progression.

Question 15

A cell is found to have twice the normal amount of DNA but has not yet begun chromosome condensation. In which phase is this cell most likely?

Accepted Answer

G2 phase

Question 16

Which of the following is a real-world consequence of errors during S phase of the cell cycle?

Accepted Answer

Genomic instability that can lead to cancer

Question 17

During which phase does the cell prepare the proteins required for mitosis and check for DNA damage?

Accepted Answer

G2 phase

Question 18

Which of the following best explains why DNA replication must occur before mitosis?

Accepted Answer

So that each daughter cell receives a complete set of genetic information

Question 19

A cell is observed to have exited the cell cycle and is performing its normal function without dividing. Which phase is this?

Accepted Answer

G0 phase

Question 20

Which of the following is the correct sequence of phases in the cell cycle, starting after cell division?

Accepted Answer

G1 → S → G2 → M

chapter 9

Guida di studio - Domande di pratica

Study guide - Flashcard